Here’s how to make a Succulent Mosaic:

Start with a frame of 5cm lumber, or use what ever is available.
Cut four pieces for the sides. Screw the pieces together firmly.
The backing can be plywood, or a flat piece of metal.
No holes are necessary for drainage, as there will be enough where it’s attached to the side pieces.

Add soil mix filling the frame.

Wire or plastic mesh is stapled over the soil.

Lots of unrooted cuttings are poked through the
mesh into the soil. Leave the frame horizontal while they root – up to
several months for some species.

Some of the best succulent species to use for outside are Sedum, Sempervivum and other hardy succulents. For indoor use; many of the smaller types of Echeveria, Crassula, tender Sedum such as Sedum morganianum (donkey tail) or Sedum calvifolia can be used.

Once they’re rooted and established, carefully hang the frame on
the wall. Water by sprinkling occasionally, or take the frame and
immerse it in a tub of water for a few minutes. Allow to drain, and
then re-hang it.

Choose a brightly lit area to display your succulent mosaic, such
as under a skylight. Your plants will flourish as long as they get
enough light.